D.2 Answers: RQs
Answers to exercises in Sect. 2.13.
|Rainwater||Rainwater from a rainwater collection tank on your property|
|Bottled||Water sold in bottles by food companies that is widely available to the public for purchase and consumption|
|Tap||Water you presently use throughout your dwelling (home)|
|Recycled||Highly purified wastewater deemed by scientists as safe for human consumption|
|Desalinated||Highly purified seawater deemed by scientists and public health officials as safe for human consumption|
Answer to Exercise 2.4: Recall that the outcome is used to describe a group (the population), not the individuals.1. The percentage of vehicles that crash. 2. The average jump height. 3. The average number of tomatoes per plant. 4. The percentage of people who own a car.
Answer to Exercise 2.5: Recall that the explanatory variable is what is actually measured on the individuals in the population.1. The type of car fuel. 2. The type of coffee. 3. The dose of iron supplement. 4. The diet.
Answer to Exercise 2.7: The unit of observation is the animal: The animals, for example, are weighed.The unit of analysis is the pen, as the food is allocated to the animals in the whole pen. In addition, the animals in the same pen are not independent: they compete for the same space, food, resources, and would all have similar environments that they share.
Answer to Exercise 2.8: The population surely is not 10 adults; that sounds like the sample. It does not make clear how many fonts are being compared (or which fonts are being used).
Perhaps try this:
Among Australian adults, is the time taken to read a passage of text different when Arial font is used compared to Times Roman font?
Answer to Exercise 2.9: The RQ is about comparing groups, so it should talk about the average lung capacity of males and females. Perhaps:
Of students that study at USC, Sippy Downs, do males have a larger average lung capacity than females?